Thanks for coming back to me on this.
Yes indeed, it needs good regular
contributions and updates from all those interested to keep it fresh. I think
your offer of sending raw material to you for “formulation” is good.
I hear what you say about needing the
source code for the programmes or the corresponding formulae. I#m sure there
are very smart people out there who would respond to a “plea for help” on these
and no doubt be happy to offer their knowledge.
Certainly the “aerial modeller” is very
Some coil modelling algorithm would be
handy too i.e. what diameter, length, turns for a given inductance and vice
Do you want to keep it focused on 472khz,
or would you entertain some articles on 137 and VLF?
I’m always asking G3XIZ for his advice!!! J
Thanks again and I’ve sent in my
registration to join too!
With best regards
Dr. Jim Cowburn
Tel. 01767 600522
Mob. 07967 300152
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creating online version of
"vertload", "tant", ... is
possible, but would require the source code of these
programs or a at least good description
of the formulas and procedures used. And (certainly for use
of the source code) the permission of the author to translate
I have already a tab "useful
links" (under "and more ..."), but it is still
empty. I haven't found the time yet to
look for interesting links.
So on this occasion I would invite everybody
to provide me with the interesting
links you would like to see there. As long as it is
more or less related to 472 kHz I will be happy
to add them!
And there are probably a lot
of interesting topics that could be covered on
the site. Just an example: How to measure ERP
(triggered by the recent question from Chris, G3XIZ).
So, if anyone has the expertise (and
time) to write something about
that, or any other interesting topic, please let me
know! You don't have to bother about the layout and if you
are not confident about your English spelling
I am sure to find a native English
speaker who will take care of that.
It would be nice if
the 472kHz.org website could become a community
project rather than a one men show.
73, Rik ON7YD - OR7T
In terms of suggestions, on the already excellent tools page, would
it be possible to add html version calculators of such classics as “vertload”
“tant” etc. Sadly most of these only run on 32bit versions of Windows and
if one is lucky to have a 64 bit machine with W7 or higher then they don’t run.
Also a “useful files page” e.g. Stefan has an excellent
spreadsheet (which he sent to me, but it’s his work so not mine to forward)
that calculates all manner of antenna and power parameters at VLF thru MF.
Perhaps we could persuade “The dark lord of Heidelberg” to upload that!
Also, John and the chaps in the US have sent me some very handy
schematics of how to interface Hafler audio amps to txs, again many on here
will already know this stuff “inside out” but it might be useful for newcomers?
A download page giving links to Winrad and such like?
A link or page on VLF? Dreamers band?
Given the demise of cycle 24 and predictions that C25 will be worse
for higher HF bands, then this may encourage some to try their hand at the low
Just a few rambling musings and it’s a great site! Already
over the past weeks Alan, G3NYK, did
write an excellent article on propagation, that is now added to the
472kHz.org website (under technical topics http://www.472khz.org/pages/technical-topics/propagation.php).
Anyone who wants to contribute in his field of
expertise is most welcome. Just contact me. I will be happy to do the
layout , have the grammar checked and help with pictures.
73, Rik ON7YD
I have set up a small website about the 472 kHz
band. The goal is:
- For newbie's: to provide some basic
information about this band, in the hope that this will attact "fresh
- For the habitue's: some tools that might make
operating on 472 kHz more interesting (and thus increasing activity).
Feel free to have a look at http://www.472khz.org/.
All suggestions how the content of this site
can be improved are welcome.
73, Rik ON7YD - OR7T